Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ecae289be23f92…

MALICIOUS

PDF

68.9 KB Created: 2021-07-09 01:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 828302b91ccc4281ce22f2075a0a08c0 SHA-1: f232500c80db27f74b1edb4c41f38a11ce56d213 SHA-256: e0ecae289be23f92857e56658a40c3830acb2dcf1d2aecd44c893cf846c0ac5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the PDF as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=electrolux+iron+aid+dryer+manual
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8rkb13qrjvgdtjdv7c9f36ofr0/wedajewoz.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ec61c7b7---kaderuboriwaruliwarufuwo.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d081c72074---90956029859.pdf
    • http://ritadas.in/userfiles/file/7542920105.pdf
    • https://weboonline.com/ckfinder/userfiles/files/wegisakupowunumumolimi.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b34f096cc50---3723948112.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210629071023.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36893d70c---1018565924.pdf
    • https://brs.jo/userfiles/files/16460340612.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb099d0234---fipuwof.pdf
    • http://holzweiss.at/30828474600.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dtofapec5hs6g8pc5d809mo4n0/90829368114.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa3e01a37---51076530506.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab41daceb14---37925600408.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/20798543509.pdf
    • https://krono-original.vn/Images_upload/files/24376843495.pdf
    • https://rkdestate.com/userfiles/file/wudavizovogokasexi.pdf
    • http://nyett.hk/uploads/news/files/woduwil.pdf
    • http://geopraxis.it/userfiles/files/32175415119.pdf
    • http://zkojicin.cz/userfiles/file/xixuruwo.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6060eda8d7---mulowopudirexaledasanasi.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16073daf7ec903---88969143884.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1bb.bin
8aa4ba7fe876e764c18d2ec300fa6fcac24da36214b4be51d93a74c71e568056
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BB 14368 bytes
font_01_sfnt_off0000d5f9.bin
dbb8a3cec55529169ecd699ed13524ba6d56eb35c1527413ba6a5b27a1e1745a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 10660 bytes
font_02_sfnt_off0000ee62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 16792 bytes